白竹与烟煤共炭化产物燃烧特性与动力学研究

文章以白竹和烟煤为原料, 在不同共炭化温度、不同掺混比条件下制备共炭化产物, 采用热重分析法研究产物在不同升温速率条件下的燃烧特性, 并采用 Kissinger-Akahira-Sunose(KAS) 法和 Flynn-Wall-Oza-wa(FWO) 法计算动力学。结果表明, 共炭化产物在燃烧过程中只出现 1 个峰, 与煤单独燃烧基本一致, 但综合燃烧特性优于煤; 随着共炭化温度升高 (350~550 ℃), 灰分增多, 燃烧效果下降; 随着升温速率提高, 样品微商热重 (derivative thermogravimetric, DTG) 曲线向高温段偏移, 但样品的失重量不变; 随着白竹掺混比增加, 共炭化产物燃烧的失重量随之减少, 着火、燃烧性能逐渐提升; 白竹与煤共炭化产物燃烧时会出现协同效应; 采用 FWO 法、KAS 法活化能结果相近, FWO 法模型较优, 其线性相关系数高于 0.95; 白竹与烟煤按质量比 7:3 掺混, 在 350 ℃ 条件下共炭化, 升温速率为 20 ℃/min 时共炭化产物综合燃烧特性指数最好 (3.98×10^{-7} min^{-2}·℃^{-3}), 最小着火能量最低 (85.85 kJ/mol)。

In this paper, Baizhu and bituminous coal were taken as raw materials, and co-carbonized products were prepared at different co-carbonization temperatures and different blending ratios. Thermogravimetric analysis (TGA) was used to study the combustion characteristics of the products at different heating rates, and the Kissinger-Akahira-Sunose (KAS) method and Flynn-Wall-Ozawa (FWO) method were used for kinetics calculation. The results showed that there was only one peak in the combustion process of co-carbonized products, which was basically consistent with the combustion of coal alone, but the comprehensive combustion characteristics were better than those of coal. With the increase of co-carbonization temperature (350-550 °C), the ash content increased and the combustion effect decreased. With the increase of heating rate, the derivative thermogravimetric (DTG) curve of the sample shifted to the high temperature zone, but the weight loss of the sample remained unchanged. With the increase of blending ratio of Baizhu, the weight loss of co-carbonized products decreased, and the ignition and combustion performance gradually improved. The co-carbonized products of Baizhu and coal had synergistic effect when burning. The activation energy results of FWO